interface SpeakHello {

     void speak();

}

class  HelloMachine {

   public void turnOn(SpeakHello hello) {

       hello.speak();

   }

}

public class Example7_3 {

   public static void main(String args[]) {

      HelloMachine machine = new HelloMachine();

      machine.turnOn( new SpeakHello(){

                          public void speak() {

                             System.out.println("hello,you are welcome!");

                          }

                      } 

                    ); 

      machine.turnOn( new SpeakHello(){

                          public void speak() {

                              System.out.println("你好，欢迎光临!");

                          }

                      } 

                    ); 

   } 

}
